fix(#756): RFC 9001 §6 key update — initiator ACK gate, consecutive detection, old-key pktnum check#824

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cherylsy:issue-756-key-update-initiator-confirm

Commits on Jun 26, 2026

[+] #756 key update initiator must wait for ACK before confirming
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[+] #756 reorder xqc_trans_err_code_t for strict ascending order

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[+] #756 eliminate race in FEC test by killing server before clearing logs

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[+] #756 rename key_update_confirmed to key_phase_synced and remove redundant flag

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[+] #756 BUG2+BUG3: fix consecutive key update dead code and add old-key pktnum detection

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[+] #756 extract xqc_key_update_acked() to replace inline ACK comparison

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[+] #756 trim comments to why-only and revert unrelated 0RTT_OK guard

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[+] #756 remove §6.2 pre-decrypt consecutive key update detection

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[+] #756 eliminate race in FEC stream tests by killing server before clearing logs

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Commits on Jun 29, 2026

[+] #756 fix consecutive key update validation
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